Which tax uses the same rate for all income levels? corporate

Taxes have so many rate base on the type of job you have its because that type of job is also rated according to the value of their salary. In an entry level, the system is use to rate there tax is called Proportional tax rate system. I hope you are satisfied with my answer and feel free to ask for more 

This can be solved with an equation.

 

now, as far as I can tell this question was made multiple choice for a reason; just start to plug in numbers. So using the answers x is either equal to 1 or 2. lets try and solve the equation plugging 2 in. When you solve for this you end up with  none of your answers have one where y<2 so x must be 1. so lets solve for x=1.
you end up getting 

The only answer where x=1 and y<4 is C sos c is your answer. Hope this helped! :)